The seismic activity documented on 9/11 was not an earthquake as a result of the collapsing towers. Naturally occurring earthquakes are the result of plate tectonics. Artificial or man-made “earthquakes” are produced by explosions and will generate seismic waves, which are measured by a seismograph to determine the level of intensity. Natural and artificial disturbances generate several different types of seismic waves, such as the P, or primary wave, and the S, or secondary wave. The differences between them allow scientists to measure the strength and location from where the wave was generated.
P waves travel faster than S waves, and are the first waves recorded by a seismograph in the event of a disturbance. P waves travel at speeds between 1 and 9 miles per second, while S waves travel significantly slower, between 1 and 5 miles per second. The S waves are the second wave to reach a seismic station measuring a disturbance. The difference in arrival times helps geologists determine the location of the earthquake.
Primary waves are made up of compression waves, also known as push-pull waves. The individual waves, therefore, push against one another, causing a constant parallel, straight motion. S waves are transverse waves, which means they vibrate up and down, perpendicular to the motion of the wave as they travel. In an S wave, particles travel up and down and the wave moves forward, like the image of a sine wave.
Due to the wave movement, P waves travel through any kind of material, whether it is a solid, liquid or gas. On the other hand, S waves only move through solids and are stopped by liquids and gases. For this reason, S waves are sometimes referred to as shear waves because they are unable to alter the volume of the material that they pass through. This also accounts why fewer S waves are recorded than P waves.
S waves are generally larger than P waves, causing much of the damage in an earthquake. Since the particles in an S wave move up and down, they move the earth around them with greater force, shaking the surface of the Earth. P waves, though easier to record, are significantly smaller and do not cause as much damage because they compress particles in only one direction.
The seismic data received by the monitoring stations on 9/11 shows that is NOT an earthquake at all. It was something much different. Here is the report by Seismologist Won-Young Kim as observed from the Columbia University’s Lamont-Doherty Earth Observatory, just 21 miles north of Ground Zero.
Immediately he knew it was not an earthquake he was observing. He was very careful in the writing of this paper by not saying what he thought it was, but he did leave clues for others to figure out. “But in the present case we are in our own New York City area; that is, the Lamont-Doherty Earth Observatory of Columbia University, in Palisades, N.Y.; and the context is inhuman actions against people and the fabric of our society” And he was not speaking about Muslim Terrorist here.
“It is not possible to infer (with detail sufficient to meet the demands of civil engineers in an emergency situation) just what the near-in ground motions must have been.”
The collapse of 7 WTC at 17:20:33 EDT was recorded but is not shown. Three other small signals shown in Figure 1 and ones at 12:07:38 and 12:10:03 EDT may have been generated by additional collapses
“The waves from the WTC events resemble those recorded by regional stations from the collapse of part of a salt mine in western New York on March 12, 1994 (ML 3.6). That source also lasted longer than that of a small earthquake. On the surface this means nothing, until you read the next part. A truck bomb at the WTC in 1993, in which approximately 0.5 tons of explosive were detonated, was not detected seismically, even at a station only 16 km away”
Did you catch the clues??? The WTC 1993 bombing did NOT produce any seismic waves that were detected at a station even closer to Manhattan than his observatory. He is telling us it was not explosives and that there is another station closer than his that must have recorded this event. So where is that data? For 18 years they have been telling us that Columbia was the closest one to receive the waves. So if its not explosives and not an earthquake, what could it be?
“Unfortunately, no seismic recordings of ground motion are currently known to exist at or very close to the WTC. Plans are pending for an Advanced National Seismic System (ANSS; see USGS ) that calls for increased urban seismic instrumentation, including New York City, and the September 11 events show that such instrumentation can be valuable to serve a purpose that sometimes transcends strict earthquake applications” See, he is still setting it up, like tangling a hook waiting for people to take a bite.
“It is more reasonable that most of the effects of those collapses on adjacent structures and people were related to the kinetic energy of falling debris and the pressure on buildings exerted by dust- and particle- laden air mobilized by falling debris. It had, except for temperature, an effect very similar to pyroclastic ash flows that descend slopes of volcanoes. The seismic shaking associated with the impacts and the main collapses probably was small compared to those other energetic processes. And this is where he reveals what caused it.
This interview done by Kim a couple days a later is more revealing.
Now back to the image comparing a real earthquake and what happened on 9/11. The units of measurement used in his report does not mean it was an earthquake, it means it was an Electromagnetic Wave.